org.apache.hadoop.gateway.shell.AbstractRequest.java Source code

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Here is the source code for org.apache.hadoop.gateway.shell.AbstractRequest.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.gateway.shell;

import groovy.lang.Closure;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.message.BasicNameValuePair;

import java.io.IOException;
import java.net.URISyntaxException;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;

public abstract class AbstractRequest<T> {

    private Hadoop session;

    protected AbstractRequest(Hadoop session) {
        this.session = session;
    }

    protected Hadoop hadoop() {
        return session;
    }

    protected HttpResponse execute(HttpRequest request) throws IOException {
        return session.executeNow(request);
    }

    protected URIBuilder uri(String... parts) throws URISyntaxException {
        return new URIBuilder(session.base() + StringUtils.join(parts));
    }

    protected void addQueryParam(URIBuilder uri, String name, Object value) {
        if (value != null) {
            uri.addParameter(name, value.toString());
        }
    }

    protected void addParam(List<NameValuePair> list, String name, String value) {
        if (value != null) {
            list.add(new BasicNameValuePair(name, value));
        }
    }

    abstract protected Callable<T> callable();

    public T now() throws HadoopException {
        try {
            return callable().call();
        } catch (Exception e) {
            throw new HadoopException(e);
        }
    }

    public Future<T> later() {
        return hadoop().executeLater(callable());
    }

    public Future<T> later(final Closure<Void> closure) {
        return hadoop().executeLater(new Callable<T>() {
            @Override
            public T call() throws Exception {
                T result = callable().call();
                closure.call(result);
                return result;
            }
        });
    }

}